do you think the political will exists in washington to pass legislation that could include a tax on carbon? >> you know, as you know, mark, we can't attribute any particular weather event to climate change. what we do know is the temperature around globe is increasing. faster than was predicted even ten years ago. the arctic icecap is melting. faster than was predicted even five years ago. we do know that there have been extraordinarily -- there have been an extraordinarily large number of severe weather events here in north america but also around the globe. and i am a firm believer that climate change is real. that it is impacted by human behavior and carbon emissions. as a consequence, i think we have an obligation to future generations to do something about it. in my first term, we doubled fuel efficiency standards on cars and trucks. that will have an impact. that will take a lot of carbon out of the atmosphere. we doubled the production of clean energy, which promises to reduce the utilization of fossil fuels for power generation. and we continue to invest in potential break-t